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Chapter Level Assignment - Light
Q1. State the two laws of reflection of light.
Q2. How does regular reflection differ from irregular reflection?
Q3. A person is able to see distant objects clearly but faces difficulty in reading a newspaper. Name the defect of his eyes and how can it be corrected?
Q4. When a single ray of light strikes a plane mirror how many reflected rays will be there?
Q5. If two plane mirrors are arranged perpendicular to each other, how many images will be formed of an object which is placed between them?
Q6. What is the nature of an image formed by the human eye?
Q7. What is blind spot in the human eye?
Q8. Name the phenomenon of splitting of white light and mention any two situations where you observe this phenomenon.
1 ANS ) First law : The angle of incidence is equal to the angle of reflection
Second law : Reflected ray, incident ray and normal at the point of incidence lie on the same plane.
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2 ANS ) Regular reflection takes place on a smooth surface while irregular or diffused reflection takes place on a rough or irregular surface.
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3 ANS ) The defect of the eye is 'Hypermetropia' or 'Long Sightedness'. It can be corrected by using a convex lens.
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4 ANS) A single light ray is reflected.
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5 ANS ) Angle between the two mirrors = 90 degrees
Formula to find the number of images formed is = 360/θ-1
= 360/90-1
= 3 images
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6 ANS ) Inverted, highly diminished.
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7 ANS ) The region on the retina where the optic nerve enters the eyeballs. There are no rods and cones (photo recipters and nerve cells ) . Images are not formed here .
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8 ANS) Phenomenon of splitting of white light into its constituent colours is known as Dispersion of light . Examples of the same are : Formation of a rainbow , Dispersion of White Light in a prism.
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By - Sana , 8C